1 |
pcg |
1.1 |
/* |
2 |
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connection.C -- manage a single connection |
3 |
pcg |
1.42 |
Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
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pcg |
1.1 |
|
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pcg |
1.42 |
This file is part of GVPE. |
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GVPE is free software; you can redistribute it and/or modify |
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pcg |
1.1 |
it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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pcg |
1.42 |
along with gvpe; if not, write to the Free Software |
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pcg |
1.55 |
Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 |
pcg |
1.1 |
*/ |
21 |
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#include "config.h" |
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pcg |
1.25 |
#include <cassert> |
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26 |
pcg |
1.1 |
#include <list> |
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28 |
pcg |
1.2 |
#include <openssl/rand.h> |
29 |
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#include <openssl/evp.h> |
30 |
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#include <openssl/rsa.h> |
31 |
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#include <openssl/err.h> |
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33 |
pcg |
1.1 |
#include "conf.h" |
34 |
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#include "slog.h" |
35 |
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#include "device.h" |
36 |
pcg |
1.2 |
#include "vpn.h" |
37 |
pcg |
1.1 |
#include "connection.h" |
38 |
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|
39 |
pcg |
1.20 |
#include "netcompat.h" |
40 |
pcg |
1.19 |
|
41 |
pcg |
1.1 |
#if !HAVE_RAND_PSEUDO_BYTES |
42 |
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# define RAND_pseudo_bytes RAND_bytes |
43 |
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#endif |
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45 |
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#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
46 |
pcg |
1.30 |
|
47 |
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#define ULTRA_FAST 1 |
48 |
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#define HLOG 15 |
49 |
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#include "lzf/lzf.h" |
50 |
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#include "lzf/lzf_c.c" |
51 |
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#include "lzf/lzf_d.c" |
52 |
pcg |
1.1 |
|
53 |
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struct crypto_ctx |
54 |
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{ |
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EVP_CIPHER_CTX cctx; |
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HMAC_CTX hctx; |
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58 |
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crypto_ctx (const rsachallenge &challenge, int enc); |
59 |
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~crypto_ctx (); |
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}; |
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crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
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{ |
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EVP_CIPHER_CTX_init (&cctx); |
65 |
pcg |
1.29 |
require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
66 |
pcg |
1.1 |
HMAC_CTX_init (&hctx); |
67 |
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HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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} |
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crypto_ctx::~crypto_ctx () |
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{ |
72 |
pcg |
1.29 |
require (EVP_CIPHER_CTX_cleanup (&cctx)); |
73 |
pcg |
1.1 |
HMAC_CTX_cleanup (&hctx); |
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} |
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static void |
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rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
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{ |
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EVP_MD_CTX ctx; |
80 |
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81 |
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EVP_MD_CTX_init (&ctx); |
82 |
pcg |
1.29 |
require (EVP_DigestInit (&ctx, RSA_HASH)); |
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require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
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require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
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require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
86 |
pcg |
1.1 |
EVP_MD_CTX_cleanup (&ctx); |
87 |
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} |
88 |
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struct rsa_entry { |
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tstamp expire; |
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rsaid id; |
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rsachallenge chg; |
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}; |
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struct rsa_cache : list<rsa_entry> |
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{ |
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pcg |
1.4 |
void cleaner_cb (time_watcher &w); time_watcher cleaner; |
98 |
pcg |
1.1 |
|
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bool find (const rsaid &id, rsachallenge &chg) |
100 |
pcg |
1.51 |
{ |
101 |
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for (iterator i = begin (); i != end (); ++i) |
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{ |
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if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
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{ |
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memcpy (&chg, &i->chg, sizeof chg); |
106 |
pcg |
1.1 |
|
107 |
pcg |
1.51 |
erase (i); |
108 |
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return true; |
109 |
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} |
110 |
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} |
111 |
pcg |
1.1 |
|
112 |
pcg |
1.51 |
if (cleaner.at < NOW) |
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cleaner.start (NOW + RSA_TTL); |
114 |
pcg |
1.1 |
|
115 |
pcg |
1.51 |
return false; |
116 |
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} |
117 |
pcg |
1.1 |
|
118 |
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void gen (rsaid &id, rsachallenge &chg) |
119 |
pcg |
1.51 |
{ |
120 |
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rsa_entry e; |
121 |
pcg |
1.1 |
|
122 |
pcg |
1.51 |
RAND_bytes ((unsigned char *)&id, sizeof id); |
123 |
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RAND_bytes ((unsigned char *)&chg, sizeof chg); |
124 |
pcg |
1.1 |
|
125 |
pcg |
1.51 |
e.expire = NOW + RSA_TTL; |
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e.id = id; |
127 |
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memcpy (&e.chg, &chg, sizeof chg); |
128 |
pcg |
1.1 |
|
129 |
pcg |
1.51 |
push_back (e); |
130 |
pcg |
1.1 |
|
131 |
pcg |
1.51 |
if (cleaner.at < NOW) |
132 |
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cleaner.start (NOW + RSA_TTL); |
133 |
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} |
134 |
pcg |
1.1 |
|
135 |
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rsa_cache () |
136 |
pcg |
1.51 |
: cleaner (this, &rsa_cache::cleaner_cb) |
137 |
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{ } |
138 |
pcg |
1.1 |
|
139 |
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} rsa_cache; |
140 |
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141 |
pcg |
1.4 |
void rsa_cache::cleaner_cb (time_watcher &w) |
142 |
pcg |
1.1 |
{ |
143 |
pcg |
1.25 |
if (!empty ()) |
144 |
pcg |
1.1 |
{ |
145 |
pcg |
1.25 |
w.start (NOW + RSA_TTL); |
146 |
pcg |
1.1 |
|
147 |
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for (iterator i = begin (); i != end (); ) |
148 |
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if (i->expire <= NOW) |
149 |
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i = erase (i); |
150 |
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else |
151 |
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++i; |
152 |
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} |
153 |
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} |
154 |
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155 |
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////////////////////////////////////////////////////////////////////////////// |
156 |
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157 |
pcg |
1.12 |
void pkt_queue::put (net_packet *p) |
158 |
pcg |
1.1 |
{ |
159 |
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if (queue[i]) |
160 |
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{ |
161 |
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delete queue[i]; |
162 |
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j = (j + 1) % QUEUEDEPTH; |
163 |
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} |
164 |
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165 |
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queue[i] = p; |
166 |
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167 |
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i = (i + 1) % QUEUEDEPTH; |
168 |
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} |
169 |
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170 |
pcg |
1.12 |
net_packet *pkt_queue::get () |
171 |
pcg |
1.1 |
{ |
172 |
pcg |
1.12 |
net_packet *p = queue[j]; |
173 |
pcg |
1.1 |
|
174 |
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if (p) |
175 |
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{ |
176 |
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queue[j] = 0; |
177 |
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j = (j + 1) % QUEUEDEPTH; |
178 |
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} |
179 |
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180 |
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return p; |
181 |
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} |
182 |
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183 |
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pkt_queue::pkt_queue () |
184 |
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{ |
185 |
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memset (queue, 0, sizeof (queue)); |
186 |
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i = 0; |
187 |
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j = 0; |
188 |
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} |
189 |
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190 |
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pkt_queue::~pkt_queue () |
191 |
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{ |
192 |
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for (i = QUEUEDEPTH; --i > 0; ) |
193 |
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delete queue[i]; |
194 |
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} |
195 |
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196 |
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struct net_rateinfo { |
197 |
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u32 host; |
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double pcnt, diff; |
199 |
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tstamp last; |
200 |
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}; |
201 |
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202 |
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// only do action once every x seconds per host whole allowing bursts. |
203 |
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// this implementation ("splay list" ;) is inefficient, |
204 |
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// but low on resources. |
205 |
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struct net_rate_limiter : list<net_rateinfo> |
206 |
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{ |
207 |
pcg |
1.35 |
# define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
208 |
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# define NRL_CUTOFF 10. // one event every CUTOFF seconds |
209 |
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# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
210 |
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# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
211 |
pcg |
1.1 |
|
212 |
pcg |
1.16 |
bool can (const sockinfo &si) { return can((u32)si.host); } |
213 |
pcg |
1.1 |
bool can (u32 host); |
214 |
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}; |
215 |
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216 |
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net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
217 |
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218 |
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bool net_rate_limiter::can (u32 host) |
219 |
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{ |
220 |
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iterator i; |
221 |
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222 |
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for (i = begin (); i != end (); ) |
223 |
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if (i->host == host) |
224 |
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break; |
225 |
pcg |
1.34 |
else if (i->last < NOW - NRL_EXPIRE) |
226 |
pcg |
1.1 |
i = erase (i); |
227 |
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else |
228 |
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i++; |
229 |
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230 |
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if (i == end ()) |
231 |
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{ |
232 |
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net_rateinfo ri; |
233 |
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234 |
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ri.host = host; |
235 |
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ri.pcnt = 1.; |
236 |
pcg |
1.34 |
ri.diff = NRL_MAXDIF; |
237 |
pcg |
1.1 |
ri.last = NOW; |
238 |
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239 |
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push_front (ri); |
240 |
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241 |
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return true; |
242 |
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} |
243 |
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else |
244 |
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{ |
245 |
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net_rateinfo ri (*i); |
246 |
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erase (i); |
247 |
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|
248 |
pcg |
1.34 |
ri.pcnt = ri.pcnt * NRL_ALPHA; |
249 |
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ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
250 |
pcg |
1.1 |
|
251 |
|
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ri.last = NOW; |
252 |
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|
253 |
pcg |
1.10 |
double dif = ri.diff / ri.pcnt; |
254 |
pcg |
1.1 |
|
255 |
pcg |
1.34 |
bool send = dif > NRL_CUTOFF; |
256 |
pcg |
1.10 |
|
257 |
pcg |
1.34 |
if (dif > NRL_MAXDIF) |
258 |
pcg |
1.10 |
{ |
259 |
|
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ri.pcnt = 1.; |
260 |
pcg |
1.34 |
ri.diff = NRL_MAXDIF; |
261 |
pcg |
1.10 |
} |
262 |
|
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else if (send) |
263 |
pcg |
1.1 |
ri.pcnt++; |
264 |
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|
265 |
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push_front (ri); |
266 |
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|
267 |
|
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return send; |
268 |
|
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} |
269 |
|
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} |
270 |
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|
271 |
|
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///////////////////////////////////////////////////////////////////////////// |
272 |
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|
273 |
|
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unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
274 |
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|
275 |
|
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void hmac_packet::hmac_gen (crypto_ctx *ctx) |
276 |
|
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{ |
277 |
|
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unsigned int xlen; |
278 |
|
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|
279 |
|
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HMAC_CTX *hctx = &ctx->hctx; |
280 |
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|
281 |
|
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HMAC_Init_ex (hctx, 0, 0, 0, 0); |
282 |
|
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HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
283 |
|
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len - sizeof (hmac_packet)); |
284 |
|
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HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
285 |
|
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} |
286 |
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|
287 |
|
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void |
288 |
|
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hmac_packet::hmac_set (crypto_ctx *ctx) |
289 |
|
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{ |
290 |
|
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hmac_gen (ctx); |
291 |
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|
292 |
|
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memcpy (hmac, hmac_digest, HMACLENGTH); |
293 |
|
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} |
294 |
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|
295 |
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bool |
296 |
|
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hmac_packet::hmac_chk (crypto_ctx *ctx) |
297 |
|
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{ |
298 |
|
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hmac_gen (ctx); |
299 |
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|
300 |
|
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return !memcmp (hmac, hmac_digest, HMACLENGTH); |
301 |
|
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} |
302 |
|
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|
303 |
pcg |
1.6 |
void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
304 |
pcg |
1.1 |
{ |
305 |
pcg |
1.6 |
type = type_; |
306 |
pcg |
1.1 |
|
307 |
|
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int src = THISNODE->id; |
308 |
|
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|
309 |
|
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src1 = src; |
310 |
|
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srcdst = ((src >> 8) << 4) | (dst >> 8); |
311 |
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dst1 = dst; |
312 |
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} |
313 |
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|
314 |
|
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#define MAXVPNDATA (MAX_MTU - 6 - 6) |
315 |
|
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#define DATAHDR (sizeof (u32) + RAND_SIZE) |
316 |
|
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|
317 |
pcg |
1.28 |
struct vpndata_packet : vpn_packet |
318 |
pcg |
1.1 |
{ |
319 |
|
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u8 data[MAXVPNDATA + DATAHDR]; // seqno |
320 |
|
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|
321 |
|
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void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
322 |
|
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tap_packet *unpack (connection *conn, u32 &seqno); |
323 |
|
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private: |
324 |
|
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|
325 |
|
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const u32 data_hdr_size () const |
326 |
|
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{ |
327 |
|
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return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
328 |
|
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} |
329 |
|
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}; |
330 |
|
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|
331 |
|
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void |
332 |
|
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vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
333 |
|
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{ |
334 |
|
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EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
335 |
|
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int outl = 0, outl2; |
336 |
|
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ptype type = PT_DATA_UNCOMPRESSED; |
337 |
|
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|
338 |
|
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#if ENABLE_COMPRESSION |
339 |
|
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u8 cdata[MAX_MTU]; |
340 |
|
|
|
341 |
pcg |
1.31 |
if (conn->features & ENABLE_COMPRESSION) |
342 |
pcg |
1.1 |
{ |
343 |
pcg |
1.31 |
u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
344 |
pcg |
1.1 |
|
345 |
pcg |
1.31 |
if (cl) |
346 |
|
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{ |
347 |
|
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type = PT_DATA_COMPRESSED; |
348 |
|
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d = cdata; |
349 |
|
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l = cl + 2; |
350 |
|
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|
351 |
|
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d[0] = cl >> 8; |
352 |
|
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d[1] = cl; |
353 |
|
|
} |
354 |
pcg |
1.1 |
} |
355 |
|
|
#endif |
356 |
|
|
|
357 |
pcg |
1.29 |
require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
358 |
pcg |
1.1 |
|
359 |
|
|
struct { |
360 |
|
|
#if RAND_SIZE |
361 |
|
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u8 rnd[RAND_SIZE]; |
362 |
|
|
#endif |
363 |
|
|
u32 seqno; |
364 |
|
|
} datahdr; |
365 |
|
|
|
366 |
|
|
datahdr.seqno = ntohl (seqno); |
367 |
|
|
#if RAND_SIZE |
368 |
|
|
RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
369 |
|
|
#endif |
370 |
|
|
|
371 |
pcg |
1.29 |
require (EVP_EncryptUpdate (cctx, |
372 |
pcg |
1.1 |
(unsigned char *) data + outl, &outl2, |
373 |
pcg |
1.29 |
(unsigned char *) &datahdr, DATAHDR)); |
374 |
pcg |
1.1 |
outl += outl2; |
375 |
|
|
|
376 |
pcg |
1.29 |
require (EVP_EncryptUpdate (cctx, |
377 |
pcg |
1.1 |
(unsigned char *) data + outl, &outl2, |
378 |
pcg |
1.29 |
(unsigned char *) d, l)); |
379 |
pcg |
1.1 |
outl += outl2; |
380 |
|
|
|
381 |
pcg |
1.29 |
require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
382 |
pcg |
1.1 |
outl += outl2; |
383 |
|
|
|
384 |
|
|
len = outl + data_hdr_size (); |
385 |
|
|
|
386 |
|
|
set_hdr (type, dst); |
387 |
|
|
|
388 |
|
|
hmac_set (conn->octx); |
389 |
|
|
} |
390 |
|
|
|
391 |
|
|
tap_packet * |
392 |
|
|
vpndata_packet::unpack (connection *conn, u32 &seqno) |
393 |
|
|
{ |
394 |
|
|
EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
395 |
|
|
int outl = 0, outl2; |
396 |
|
|
tap_packet *p = new tap_packet; |
397 |
|
|
u8 *d; |
398 |
|
|
u32 l = len - data_hdr_size (); |
399 |
|
|
|
400 |
pcg |
1.29 |
require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
401 |
pcg |
1.1 |
|
402 |
|
|
#if ENABLE_COMPRESSION |
403 |
|
|
u8 cdata[MAX_MTU]; |
404 |
|
|
|
405 |
|
|
if (type == PT_DATA_COMPRESSED) |
406 |
|
|
d = cdata; |
407 |
|
|
else |
408 |
|
|
#endif |
409 |
|
|
d = &(*p)[6 + 6 - DATAHDR]; |
410 |
|
|
|
411 |
|
|
/* this overwrites part of the src mac, but we fix that later */ |
412 |
pcg |
1.29 |
require (EVP_DecryptUpdate (cctx, |
413 |
pcg |
1.1 |
d, &outl2, |
414 |
pcg |
1.29 |
(unsigned char *)&data, len - data_hdr_size ())); |
415 |
pcg |
1.1 |
outl += outl2; |
416 |
|
|
|
417 |
pcg |
1.29 |
require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
418 |
pcg |
1.1 |
outl += outl2; |
419 |
|
|
|
420 |
|
|
seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
421 |
|
|
|
422 |
|
|
id2mac (dst () ? dst() : THISNODE->id, p->dst); |
423 |
|
|
id2mac (src (), p->src); |
424 |
|
|
|
425 |
|
|
#if ENABLE_COMPRESSION |
426 |
|
|
if (type == PT_DATA_COMPRESSED) |
427 |
|
|
{ |
428 |
|
|
u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
429 |
|
|
|
430 |
|
|
p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0, |
431 |
|
|
&(*p)[6 + 6], MAX_MTU) |
432 |
|
|
+ 6 + 6; |
433 |
|
|
} |
434 |
|
|
else |
435 |
|
|
p->len = outl + (6 + 6 - DATAHDR); |
436 |
|
|
#endif |
437 |
|
|
|
438 |
|
|
return p; |
439 |
|
|
} |
440 |
|
|
|
441 |
|
|
struct ping_packet : vpn_packet |
442 |
|
|
{ |
443 |
|
|
void setup (int dst, ptype type) |
444 |
|
|
{ |
445 |
|
|
set_hdr (type, dst); |
446 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
447 |
|
|
} |
448 |
|
|
}; |
449 |
|
|
|
450 |
|
|
struct config_packet : vpn_packet |
451 |
|
|
{ |
452 |
|
|
// actually, hmaclen cannot be checked because the hmac |
453 |
|
|
// field comes before this data, so peers with other |
454 |
|
|
// hmacs simply will not work. |
455 |
|
|
u8 prot_major, prot_minor, randsize, hmaclen; |
456 |
pcg |
1.31 |
u8 flags, challengelen, features, pad3; |
457 |
pcg |
1.1 |
u32 cipher_nid, digest_nid, hmac_nid; |
458 |
|
|
|
459 |
|
|
void setup (ptype type, int dst); |
460 |
|
|
bool chk_config () const; |
461 |
pcg |
1.32 |
|
462 |
|
|
static u8 get_features () |
463 |
|
|
{ |
464 |
|
|
u8 f = 0; |
465 |
|
|
#if ENABLE_COMPRESSION |
466 |
|
|
f |= FEATURE_COMPRESSION; |
467 |
|
|
#endif |
468 |
|
|
#if ENABLE_ROHC |
469 |
|
|
f |= FEATURE_ROHC; |
470 |
|
|
#endif |
471 |
|
|
return f; |
472 |
|
|
} |
473 |
pcg |
1.1 |
}; |
474 |
|
|
|
475 |
|
|
void config_packet::setup (ptype type, int dst) |
476 |
|
|
{ |
477 |
|
|
prot_major = PROTOCOL_MAJOR; |
478 |
|
|
prot_minor = PROTOCOL_MINOR; |
479 |
|
|
randsize = RAND_SIZE; |
480 |
|
|
hmaclen = HMACLENGTH; |
481 |
pcg |
1.48 |
flags = 0; |
482 |
pcg |
1.1 |
challengelen = sizeof (rsachallenge); |
483 |
pcg |
1.32 |
features = get_features (); |
484 |
pcg |
1.1 |
|
485 |
|
|
cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
486 |
|
|
digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
487 |
|
|
hmac_nid = htonl (EVP_MD_type (DIGEST)); |
488 |
|
|
|
489 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
490 |
|
|
set_hdr (type, dst); |
491 |
|
|
} |
492 |
|
|
|
493 |
|
|
bool config_packet::chk_config () const |
494 |
|
|
{ |
495 |
pcg |
1.15 |
if (prot_major != PROTOCOL_MAJOR) |
496 |
pcg |
1.23 |
slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
497 |
pcg |
1.15 |
else if (randsize != RAND_SIZE) |
498 |
pcg |
1.23 |
slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
499 |
pcg |
1.15 |
else if (hmaclen != HMACLENGTH) |
500 |
pcg |
1.23 |
slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
501 |
pcg |
1.15 |
else if (challengelen != sizeof (rsachallenge)) |
502 |
pcg |
1.23 |
slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
503 |
pcg |
1.15 |
else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
504 |
pcg |
1.23 |
slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
505 |
pcg |
1.15 |
else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
506 |
pcg |
1.23 |
slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
507 |
pcg |
1.15 |
else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
508 |
pcg |
1.23 |
slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
509 |
pcg |
1.15 |
else |
510 |
|
|
return true; |
511 |
|
|
|
512 |
|
|
return false; |
513 |
pcg |
1.1 |
} |
514 |
|
|
|
515 |
|
|
struct auth_req_packet : config_packet |
516 |
|
|
{ |
517 |
|
|
char magic[8]; |
518 |
|
|
u8 initiate; // false if this is just an automatic reply |
519 |
pcg |
1.28 |
u8 protocols; // supported protocols (will be patched on forward) |
520 |
pcg |
1.1 |
u8 pad2, pad3; |
521 |
|
|
rsaid id; |
522 |
|
|
rsaencrdata encr; |
523 |
|
|
|
524 |
|
|
auth_req_packet (int dst, bool initiate_, u8 protocols_) |
525 |
|
|
{ |
526 |
|
|
config_packet::setup (PT_AUTH_REQ, dst); |
527 |
|
|
strncpy (magic, MAGIC, 8); |
528 |
|
|
initiate = !!initiate_; |
529 |
|
|
protocols = protocols_; |
530 |
|
|
|
531 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
532 |
|
|
} |
533 |
|
|
}; |
534 |
|
|
|
535 |
|
|
struct auth_res_packet : config_packet |
536 |
|
|
{ |
537 |
|
|
rsaid id; |
538 |
|
|
u8 pad1, pad2, pad3; |
539 |
|
|
u8 response_len; // encrypted length |
540 |
|
|
rsaresponse response; |
541 |
|
|
|
542 |
|
|
auth_res_packet (int dst) |
543 |
|
|
{ |
544 |
|
|
config_packet::setup (PT_AUTH_RES, dst); |
545 |
|
|
|
546 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
547 |
|
|
} |
548 |
|
|
}; |
549 |
|
|
|
550 |
|
|
struct connect_req_packet : vpn_packet |
551 |
|
|
{ |
552 |
|
|
u8 id, protocols; |
553 |
|
|
u8 pad1, pad2; |
554 |
|
|
|
555 |
|
|
connect_req_packet (int dst, int id_, u8 protocols_) |
556 |
|
|
: id(id_) |
557 |
|
|
, protocols(protocols_) |
558 |
|
|
{ |
559 |
|
|
set_hdr (PT_CONNECT_REQ, dst); |
560 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
561 |
|
|
} |
562 |
|
|
}; |
563 |
|
|
|
564 |
|
|
struct connect_info_packet : vpn_packet |
565 |
|
|
{ |
566 |
|
|
u8 id, protocols; |
567 |
|
|
u8 pad1, pad2; |
568 |
|
|
sockinfo si; |
569 |
|
|
|
570 |
|
|
connect_info_packet (int dst, int id_, const sockinfo &si_, u8 protocols_) |
571 |
|
|
: id(id_) |
572 |
|
|
, protocols(protocols_) |
573 |
|
|
, si(si_) |
574 |
|
|
{ |
575 |
|
|
set_hdr (PT_CONNECT_INFO, dst); |
576 |
|
|
|
577 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
578 |
|
|
} |
579 |
|
|
}; |
580 |
|
|
|
581 |
|
|
///////////////////////////////////////////////////////////////////////////// |
582 |
|
|
|
583 |
|
|
void |
584 |
pcg |
1.10 |
connection::connection_established () |
585 |
|
|
{ |
586 |
|
|
if (ictx && octx) |
587 |
|
|
{ |
588 |
|
|
connectmode = conf->connectmode; |
589 |
|
|
|
590 |
pcg |
1.36 |
// make sure rekeying timeouts are slightly asymmetric |
591 |
|
|
rekey.start (NOW + ::conf.rekey |
592 |
|
|
+ (conf->id > THISNODE->id ? 10 : 0)); |
593 |
pcg |
1.10 |
keepalive.start (NOW + ::conf.keepalive); |
594 |
|
|
|
595 |
|
|
// send queued packets |
596 |
|
|
if (ictx && octx) |
597 |
pcg |
1.12 |
{ |
598 |
|
|
while (tap_packet *p = (tap_packet *)data_queue.get ()) |
599 |
|
|
{ |
600 |
|
|
send_data_packet (p); |
601 |
|
|
delete p; |
602 |
|
|
} |
603 |
|
|
|
604 |
|
|
while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
605 |
|
|
{ |
606 |
|
|
send_vpn_packet (p, si, IPTOS_RELIABILITY); |
607 |
|
|
delete p; |
608 |
|
|
} |
609 |
|
|
} |
610 |
pcg |
1.10 |
} |
611 |
|
|
else |
612 |
|
|
{ |
613 |
|
|
retry_cnt = 0; |
614 |
|
|
establish_connection.start (NOW + 5); |
615 |
pcg |
1.25 |
keepalive.stop (); |
616 |
|
|
rekey.stop (); |
617 |
pcg |
1.10 |
} |
618 |
|
|
} |
619 |
|
|
|
620 |
|
|
void |
621 |
pcg |
1.8 |
connection::reset_si () |
622 |
pcg |
1.1 |
{ |
623 |
pcg |
1.6 |
protocol = best_protocol (THISNODE->protocols & conf->protocols); |
624 |
|
|
|
625 |
|
|
// mask out protocols we cannot establish |
626 |
|
|
if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
627 |
|
|
if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
628 |
pcg |
1.40 |
if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
629 |
pcg |
1.6 |
|
630 |
|
|
si.set (conf, protocol); |
631 |
pcg |
1.1 |
} |
632 |
|
|
|
633 |
pcg |
1.8 |
// ensure sockinfo is valid, forward if necessary |
634 |
|
|
const sockinfo & |
635 |
|
|
connection::forward_si (const sockinfo &si) const |
636 |
|
|
{ |
637 |
|
|
if (!si.valid ()) |
638 |
|
|
{ |
639 |
|
|
connection *r = vpn->find_router (); |
640 |
|
|
|
641 |
|
|
if (r) |
642 |
|
|
{ |
643 |
pcg |
1.46 |
slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
644 |
|
|
conf->nodename, r->conf->nodename, (const char *)r->si); |
645 |
pcg |
1.8 |
return r->si; |
646 |
|
|
} |
647 |
|
|
else |
648 |
|
|
slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
649 |
|
|
conf->nodename); |
650 |
|
|
} |
651 |
|
|
|
652 |
|
|
return si; |
653 |
|
|
} |
654 |
|
|
|
655 |
pcg |
1.1 |
void |
656 |
pcg |
1.10 |
connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
657 |
|
|
{ |
658 |
pcg |
1.46 |
if (!vpn->send_vpn_packet (pkt, si, tos)) |
659 |
pcg |
1.10 |
reset_connection (); |
660 |
|
|
} |
661 |
|
|
|
662 |
|
|
void |
663 |
pcg |
1.1 |
connection::send_ping (const sockinfo &si, u8 pong) |
664 |
|
|
{ |
665 |
|
|
ping_packet *pkt = new ping_packet; |
666 |
|
|
|
667 |
|
|
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
668 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
669 |
pcg |
1.1 |
|
670 |
|
|
delete pkt; |
671 |
|
|
} |
672 |
|
|
|
673 |
|
|
void |
674 |
|
|
connection::send_reset (const sockinfo &si) |
675 |
|
|
{ |
676 |
|
|
if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
677 |
|
|
{ |
678 |
|
|
config_packet *pkt = new config_packet; |
679 |
|
|
|
680 |
|
|
pkt->setup (vpn_packet::PT_RESET, conf->id); |
681 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_MINCOST); |
682 |
pcg |
1.1 |
|
683 |
|
|
delete pkt; |
684 |
|
|
} |
685 |
|
|
} |
686 |
|
|
|
687 |
|
|
void |
688 |
|
|
connection::send_auth_request (const sockinfo &si, bool initiate) |
689 |
|
|
{ |
690 |
|
|
auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
691 |
|
|
|
692 |
pcg |
1.6 |
rsachallenge chg; |
693 |
|
|
rsa_cache.gen (pkt->id, chg); |
694 |
pcg |
1.24 |
rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
695 |
pcg |
1.1 |
|
696 |
pcg |
1.6 |
slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
697 |
pcg |
1.1 |
|
698 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
699 |
pcg |
1.1 |
|
700 |
pcg |
1.6 |
delete pkt; |
701 |
pcg |
1.1 |
} |
702 |
|
|
|
703 |
|
|
void |
704 |
|
|
connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
705 |
|
|
{ |
706 |
|
|
auth_res_packet *pkt = new auth_res_packet (conf->id); |
707 |
|
|
|
708 |
|
|
pkt->id = id; |
709 |
|
|
|
710 |
|
|
rsa_hash (id, chg, pkt->response); |
711 |
|
|
|
712 |
|
|
pkt->hmac_set (octx); |
713 |
|
|
|
714 |
|
|
slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
715 |
|
|
|
716 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
717 |
pcg |
1.1 |
|
718 |
|
|
delete pkt; |
719 |
|
|
} |
720 |
|
|
|
721 |
|
|
void |
722 |
|
|
connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
723 |
|
|
{ |
724 |
|
|
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
725 |
|
|
conf->id, rid, (const char *)rsi); |
726 |
|
|
|
727 |
|
|
connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
728 |
|
|
|
729 |
|
|
r->hmac_set (octx); |
730 |
pcg |
1.10 |
send_vpn_packet (r, si); |
731 |
pcg |
1.1 |
|
732 |
|
|
delete r; |
733 |
|
|
} |
734 |
|
|
|
735 |
|
|
void |
736 |
pcg |
1.4 |
connection::establish_connection_cb (time_watcher &w) |
737 |
pcg |
1.1 |
{ |
738 |
pcg |
1.25 |
if (!ictx |
739 |
|
|
&& conf != THISNODE |
740 |
|
|
&& connectmode != conf_node::C_NEVER |
741 |
|
|
&& connectmode != conf_node::C_DISABLED |
742 |
pcg |
1.26 |
&& NOW > w.at) |
743 |
pcg |
1.1 |
{ |
744 |
pcg |
1.47 |
w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
745 |
pcg |
1.1 |
|
746 |
pcg |
1.47 |
double retry_int = double (retry_cnt & 3 |
747 |
|
|
? (retry_cnt & 3) + 1 |
748 |
|
|
: 1 << (retry_cnt >> 2)); |
749 |
pcg |
1.1 |
|
750 |
pcg |
1.47 |
reset_si (); |
751 |
pcg |
1.1 |
|
752 |
pcg |
1.47 |
bool slow = si.prot & PROT_SLOW; |
753 |
pcg |
1.8 |
|
754 |
|
|
if (si.prot && !si.host) |
755 |
pcg |
1.10 |
vpn->send_connect_request (conf->id); |
756 |
pcg |
1.8 |
else |
757 |
pcg |
1.1 |
{ |
758 |
pcg |
1.8 |
const sockinfo &dsi = forward_si (si); |
759 |
pcg |
1.6 |
|
760 |
pcg |
1.47 |
slow = slow || (dsi.prot & PROT_SLOW); |
761 |
|
|
|
762 |
pcg |
1.8 |
if (dsi.valid () && auth_rate_limiter.can (dsi)) |
763 |
|
|
{ |
764 |
|
|
if (retry_cnt < 4) |
765 |
|
|
send_auth_request (dsi, true); |
766 |
|
|
else |
767 |
|
|
send_ping (dsi, 0); |
768 |
|
|
} |
769 |
pcg |
1.1 |
} |
770 |
pcg |
1.47 |
|
771 |
pcg |
1.49 |
retry_int *= slow ? 8. : 0.7; |
772 |
pcg |
1.47 |
|
773 |
|
|
if (retry_int < conf->max_retry) |
774 |
|
|
retry_cnt++; |
775 |
|
|
else |
776 |
|
|
retry_int = conf->max_retry; |
777 |
|
|
|
778 |
|
|
w.start (NOW + retry_int); |
779 |
pcg |
1.1 |
} |
780 |
|
|
} |
781 |
|
|
|
782 |
|
|
void |
783 |
|
|
connection::reset_connection () |
784 |
|
|
{ |
785 |
|
|
if (ictx && octx) |
786 |
|
|
{ |
787 |
|
|
slog (L_INFO, _("%s(%s): connection lost"), |
788 |
|
|
conf->nodename, (const char *)si); |
789 |
|
|
|
790 |
|
|
if (::conf.script_node_down) |
791 |
pcg |
1.52 |
if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
792 |
|
|
slog (L_WARN, _("node-down command execution failed, continuing.")); |
793 |
pcg |
1.1 |
} |
794 |
|
|
|
795 |
|
|
delete ictx; ictx = 0; |
796 |
|
|
delete octx; octx = 0; |
797 |
pcg |
1.44 |
#if ENABLE_DNS |
798 |
pcg |
1.45 |
dnsv4_reset_connection (); |
799 |
pcg |
1.44 |
#endif |
800 |
pcg |
1.1 |
|
801 |
pcg |
1.38 |
si.host = 0; |
802 |
pcg |
1.1 |
|
803 |
|
|
last_activity = 0; |
804 |
|
|
retry_cnt = 0; |
805 |
|
|
|
806 |
pcg |
1.25 |
rekey.stop (); |
807 |
|
|
keepalive.stop (); |
808 |
|
|
establish_connection.stop (); |
809 |
pcg |
1.1 |
} |
810 |
|
|
|
811 |
|
|
void |
812 |
|
|
connection::shutdown () |
813 |
|
|
{ |
814 |
|
|
if (ictx && octx) |
815 |
|
|
send_reset (si); |
816 |
|
|
|
817 |
|
|
reset_connection (); |
818 |
|
|
} |
819 |
|
|
|
820 |
|
|
void |
821 |
pcg |
1.4 |
connection::rekey_cb (time_watcher &w) |
822 |
pcg |
1.1 |
{ |
823 |
|
|
reset_connection (); |
824 |
|
|
establish_connection (); |
825 |
|
|
} |
826 |
|
|
|
827 |
|
|
void |
828 |
pcg |
1.21 |
connection::send_data_packet (tap_packet *pkt) |
829 |
pcg |
1.1 |
{ |
830 |
|
|
vpndata_packet *p = new vpndata_packet; |
831 |
|
|
int tos = 0; |
832 |
|
|
|
833 |
pcg |
1.12 |
// I am not hilarious about peeking into packets, but so be it. |
834 |
pcg |
1.21 |
if (conf->inherit_tos && pkt->is_ipv4 ()) |
835 |
pcg |
1.1 |
tos = (*pkt)[15] & IPTOS_TOS_MASK; |
836 |
|
|
|
837 |
pcg |
1.21 |
p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
838 |
pcg |
1.10 |
send_vpn_packet (p, si, tos); |
839 |
pcg |
1.1 |
|
840 |
|
|
delete p; |
841 |
|
|
|
842 |
|
|
if (oseqno > MAX_SEQNO) |
843 |
|
|
rekey (); |
844 |
|
|
} |
845 |
|
|
|
846 |
|
|
void |
847 |
pcg |
1.21 |
connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
848 |
pcg |
1.1 |
{ |
849 |
|
|
if (ictx && octx) |
850 |
pcg |
1.21 |
send_data_packet (pkt); |
851 |
pcg |
1.1 |
else |
852 |
|
|
{ |
853 |
pcg |
1.56 |
if (!broadcast) |
854 |
pcg |
1.12 |
data_queue.put (new tap_packet (*pkt)); |
855 |
pcg |
1.1 |
|
856 |
|
|
establish_connection (); |
857 |
|
|
} |
858 |
|
|
} |
859 |
|
|
|
860 |
pcg |
1.8 |
void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
861 |
|
|
{ |
862 |
|
|
if (ictx && octx) |
863 |
pcg |
1.10 |
send_vpn_packet (pkt, si, tos); |
864 |
pcg |
1.8 |
else |
865 |
pcg |
1.12 |
{ |
866 |
pcg |
1.28 |
vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
867 |
pcg |
1.12 |
|
868 |
|
|
establish_connection (); |
869 |
|
|
} |
870 |
pcg |
1.8 |
} |
871 |
|
|
|
872 |
pcg |
1.1 |
void |
873 |
|
|
connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
874 |
|
|
{ |
875 |
|
|
last_activity = NOW; |
876 |
|
|
|
877 |
|
|
slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
878 |
|
|
conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
879 |
|
|
|
880 |
|
|
switch (pkt->typ ()) |
881 |
|
|
{ |
882 |
pcg |
1.3 |
case vpn_packet::PT_PING: |
883 |
|
|
// we send pings instead of auth packets after some retries, |
884 |
|
|
// so reset the retry counter and establish a connection |
885 |
|
|
// when we receive a ping. |
886 |
|
|
if (!ictx) |
887 |
|
|
{ |
888 |
|
|
if (auth_rate_limiter.can (rsi)) |
889 |
|
|
send_auth_request (rsi, true); |
890 |
|
|
} |
891 |
|
|
else |
892 |
|
|
send_ping (rsi, 1); // pong |
893 |
|
|
|
894 |
|
|
break; |
895 |
|
|
|
896 |
|
|
case vpn_packet::PT_PONG: |
897 |
|
|
break; |
898 |
|
|
|
899 |
|
|
case vpn_packet::PT_RESET: |
900 |
pcg |
1.1 |
{ |
901 |
pcg |
1.3 |
reset_connection (); |
902 |
|
|
|
903 |
|
|
config_packet *p = (config_packet *) pkt; |
904 |
|
|
|
905 |
|
|
if (!p->chk_config ()) |
906 |
|
|
{ |
907 |
|
|
slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
908 |
|
|
conf->nodename, (const char *)rsi); |
909 |
|
|
connectmode = conf_node::C_DISABLED; |
910 |
|
|
} |
911 |
|
|
else if (connectmode == conf_node::C_ALWAYS) |
912 |
|
|
establish_connection (); |
913 |
pcg |
1.1 |
} |
914 |
pcg |
1.3 |
break; |
915 |
|
|
|
916 |
|
|
case vpn_packet::PT_AUTH_REQ: |
917 |
|
|
if (auth_rate_limiter.can (rsi)) |
918 |
|
|
{ |
919 |
|
|
auth_req_packet *p = (auth_req_packet *) pkt; |
920 |
|
|
|
921 |
|
|
slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
922 |
pcg |
1.1 |
|
923 |
pcg |
1.3 |
if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
924 |
|
|
{ |
925 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
926 |
|
|
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
927 |
|
|
conf->nodename, (const char *)rsi, |
928 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
929 |
|
|
|
930 |
|
|
if (p->initiate) |
931 |
|
|
send_auth_request (rsi, false); |
932 |
|
|
|
933 |
|
|
rsachallenge k; |
934 |
|
|
|
935 |
pcg |
1.24 |
if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
936 |
pcg |
1.23 |
{ |
937 |
|
|
slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
938 |
|
|
conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
939 |
|
|
break; |
940 |
|
|
} |
941 |
pcg |
1.3 |
else |
942 |
|
|
{ |
943 |
|
|
delete octx; |
944 |
pcg |
1.1 |
|
945 |
pcg |
1.3 |
octx = new crypto_ctx (k, 1); |
946 |
|
|
oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
947 |
pcg |
1.1 |
|
948 |
pcg |
1.3 |
conf->protocols = p->protocols; |
949 |
pcg |
1.32 |
features = p->features & config_packet::get_features (); |
950 |
pcg |
1.10 |
|
951 |
pcg |
1.3 |
send_auth_response (rsi, p->id, k); |
952 |
|
|
|
953 |
pcg |
1.10 |
connection_established (); |
954 |
|
|
|
955 |
pcg |
1.3 |
break; |
956 |
|
|
} |
957 |
|
|
} |
958 |
pcg |
1.15 |
else |
959 |
|
|
slog (L_WARN, _("%s(%s): protocol mismatch"), |
960 |
|
|
conf->nodename, (const char *)rsi); |
961 |
pcg |
1.3 |
|
962 |
|
|
send_reset (rsi); |
963 |
pcg |
1.1 |
} |
964 |
|
|
|
965 |
pcg |
1.3 |
break; |
966 |
|
|
|
967 |
|
|
case vpn_packet::PT_AUTH_RES: |
968 |
pcg |
1.1 |
{ |
969 |
pcg |
1.3 |
auth_res_packet *p = (auth_res_packet *) pkt; |
970 |
pcg |
1.1 |
|
971 |
pcg |
1.3 |
slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
972 |
pcg |
1.1 |
|
973 |
pcg |
1.3 |
if (p->chk_config ()) |
974 |
pcg |
1.1 |
{ |
975 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
976 |
|
|
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
977 |
|
|
conf->nodename, (const char *)rsi, |
978 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
979 |
|
|
|
980 |
pcg |
1.3 |
rsachallenge chg; |
981 |
pcg |
1.1 |
|
982 |
pcg |
1.3 |
if (!rsa_cache.find (p->id, chg)) |
983 |
pcg |
1.13 |
{ |
984 |
pcg |
1.18 |
slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
985 |
pcg |
1.13 |
conf->nodename, (const char *)rsi); |
986 |
|
|
break; |
987 |
|
|
} |
988 |
pcg |
1.1 |
else |
989 |
|
|
{ |
990 |
pcg |
1.3 |
crypto_ctx *cctx = new crypto_ctx (chg, 0); |
991 |
|
|
|
992 |
|
|
if (!p->hmac_chk (cctx)) |
993 |
pcg |
1.18 |
{ |
994 |
|
|
slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
995 |
pcg |
1.27 |
"could be an attack, or just corruption or a synchronization error"), |
996 |
pcg |
1.18 |
conf->nodename, (const char *)rsi); |
997 |
|
|
break; |
998 |
|
|
} |
999 |
pcg |
1.3 |
else |
1000 |
|
|
{ |
1001 |
|
|
rsaresponse h; |
1002 |
|
|
|
1003 |
|
|
rsa_hash (p->id, chg, h); |
1004 |
|
|
|
1005 |
|
|
if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
1006 |
|
|
{ |
1007 |
|
|
prot_minor = p->prot_minor; |
1008 |
|
|
|
1009 |
|
|
delete ictx; ictx = cctx; |
1010 |
|
|
|
1011 |
|
|
iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1012 |
|
|
|
1013 |
|
|
si = rsi; |
1014 |
pcg |
1.7 |
protocol = rsi.prot; |
1015 |
pcg |
1.3 |
|
1016 |
pcg |
1.10 |
connection_established (); |
1017 |
pcg |
1.1 |
|
1018 |
pcg |
1.7 |
slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1019 |
pcg |
1.3 |
conf->nodename, (const char *)rsi, |
1020 |
|
|
p->prot_major, p->prot_minor); |
1021 |
pcg |
1.1 |
|
1022 |
pcg |
1.3 |
if (::conf.script_node_up) |
1023 |
pcg |
1.52 |
if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
1024 |
|
|
slog (L_WARN, _("node-up command execution failed, continuing.")); |
1025 |
pcg |
1.1 |
|
1026 |
pcg |
1.3 |
break; |
1027 |
|
|
} |
1028 |
|
|
else |
1029 |
|
|
slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1030 |
|
|
conf->nodename, (const char *)rsi); |
1031 |
|
|
} |
1032 |
pcg |
1.1 |
|
1033 |
pcg |
1.3 |
delete cctx; |
1034 |
pcg |
1.1 |
} |
1035 |
|
|
} |
1036 |
|
|
} |
1037 |
|
|
|
1038 |
pcg |
1.3 |
send_reset (rsi); |
1039 |
|
|
break; |
1040 |
pcg |
1.1 |
|
1041 |
pcg |
1.3 |
case vpn_packet::PT_DATA_COMPRESSED: |
1042 |
|
|
#if !ENABLE_COMPRESSION |
1043 |
|
|
send_reset (rsi); |
1044 |
|
|
break; |
1045 |
|
|
#endif |
1046 |
pcg |
1.1 |
|
1047 |
pcg |
1.3 |
case vpn_packet::PT_DATA_UNCOMPRESSED: |
1048 |
pcg |
1.1 |
|
1049 |
pcg |
1.3 |
if (ictx && octx) |
1050 |
pcg |
1.1 |
{ |
1051 |
pcg |
1.3 |
vpndata_packet *p = (vpndata_packet *)pkt; |
1052 |
pcg |
1.1 |
|
1053 |
pcg |
1.10 |
if (!p->hmac_chk (ictx)) |
1054 |
|
|
slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1055 |
pcg |
1.27 |
"could be an attack, or just corruption or a synchronization error"), |
1056 |
pcg |
1.10 |
conf->nodename, (const char *)rsi); |
1057 |
|
|
else |
1058 |
pcg |
1.1 |
{ |
1059 |
pcg |
1.10 |
u32 seqno; |
1060 |
|
|
tap_packet *d = p->unpack (this, seqno); |
1061 |
|
|
|
1062 |
|
|
if (iseqno.recv_ok (seqno)) |
1063 |
pcg |
1.1 |
{ |
1064 |
pcg |
1.10 |
vpn->tap->send (d); |
1065 |
pcg |
1.1 |
|
1066 |
pcg |
1.10 |
if (si != rsi) |
1067 |
pcg |
1.1 |
{ |
1068 |
pcg |
1.56 |
// fast re-sync on source address changes, useful especially for tcp/ip |
1069 |
pcg |
1.10 |
si = rsi; |
1070 |
pcg |
1.1 |
|
1071 |
pcg |
1.10 |
slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1072 |
|
|
conf->nodename, (const char *)si, (const char *)rsi); |
1073 |
|
|
} |
1074 |
pcg |
1.32 |
} |
1075 |
pcg |
1.3 |
|
1076 |
pcg |
1.32 |
delete d; |
1077 |
|
|
break; |
1078 |
pcg |
1.1 |
} |
1079 |
|
|
} |
1080 |
|
|
|
1081 |
pcg |
1.3 |
send_reset (rsi); |
1082 |
|
|
break; |
1083 |
pcg |
1.1 |
|
1084 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_REQ: |
1085 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1086 |
|
|
{ |
1087 |
|
|
connect_req_packet *p = (connect_req_packet *) pkt; |
1088 |
pcg |
1.1 |
|
1089 |
pcg |
1.3 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1090 |
pcg |
1.7 |
connection *c = vpn->conns[p->id - 1]; |
1091 |
pcg |
1.3 |
conf->protocols = p->protocols; |
1092 |
pcg |
1.1 |
|
1093 |
pcg |
1.3 |
slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1094 |
|
|
conf->id, p->id, c->ictx && c->octx); |
1095 |
pcg |
1.1 |
|
1096 |
pcg |
1.3 |
if (c->ictx && c->octx) |
1097 |
|
|
{ |
1098 |
|
|
// send connect_info packets to both sides, in case one is |
1099 |
|
|
// behind a nat firewall (or both ;) |
1100 |
|
|
c->send_connect_info (conf->id, si, conf->protocols); |
1101 |
|
|
send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1102 |
|
|
} |
1103 |
pcg |
1.11 |
else |
1104 |
|
|
c->establish_connection (); |
1105 |
pcg |
1.3 |
} |
1106 |
pcg |
1.1 |
|
1107 |
pcg |
1.3 |
break; |
1108 |
pcg |
1.1 |
|
1109 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_INFO: |
1110 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1111 |
|
|
{ |
1112 |
pcg |
1.39 |
connect_info_packet *p = (connect_info_packet *)pkt; |
1113 |
pcg |
1.1 |
|
1114 |
pcg |
1.39 |
if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1115 |
|
|
{ |
1116 |
|
|
connection *c = vpn->conns[p->id - 1]; |
1117 |
pcg |
1.7 |
|
1118 |
pcg |
1.39 |
c->conf->protocols = p->protocols; |
1119 |
|
|
protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1120 |
|
|
p->si.upgrade_protocol (protocol, c->conf); |
1121 |
pcg |
1.1 |
|
1122 |
pcg |
1.39 |
slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1123 |
|
|
conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1124 |
pcg |
1.7 |
|
1125 |
pcg |
1.39 |
const sockinfo &dsi = forward_si (p->si); |
1126 |
pcg |
1.1 |
|
1127 |
pcg |
1.39 |
if (dsi.valid ()) |
1128 |
|
|
c->send_auth_request (dsi, true); |
1129 |
|
|
} |
1130 |
pcg |
1.3 |
} |
1131 |
pcg |
1.1 |
|
1132 |
pcg |
1.3 |
break; |
1133 |
pcg |
1.1 |
|
1134 |
pcg |
1.3 |
default: |
1135 |
|
|
send_reset (rsi); |
1136 |
|
|
break; |
1137 |
pcg |
1.1 |
} |
1138 |
|
|
} |
1139 |
|
|
|
1140 |
pcg |
1.4 |
void connection::keepalive_cb (time_watcher &w) |
1141 |
pcg |
1.1 |
{ |
1142 |
|
|
if (NOW >= last_activity + ::conf.keepalive + 30) |
1143 |
|
|
{ |
1144 |
|
|
reset_connection (); |
1145 |
|
|
establish_connection (); |
1146 |
|
|
} |
1147 |
|
|
else if (NOW < last_activity + ::conf.keepalive) |
1148 |
pcg |
1.25 |
w.start (last_activity + ::conf.keepalive); |
1149 |
pcg |
1.1 |
else if (conf->connectmode != conf_node::C_ONDEMAND |
1150 |
|
|
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
1151 |
|
|
{ |
1152 |
|
|
send_ping (si); |
1153 |
pcg |
1.25 |
w.start (NOW + 5); |
1154 |
pcg |
1.1 |
} |
1155 |
pcg |
1.12 |
else if (NOW < last_activity + ::conf.keepalive + 10) |
1156 |
|
|
// hold ondemand connections implicitly a few seconds longer |
1157 |
|
|
// should delete octx, though, or something like that ;) |
1158 |
pcg |
1.25 |
w.start (last_activity + ::conf.keepalive + 10); |
1159 |
pcg |
1.1 |
else |
1160 |
|
|
reset_connection (); |
1161 |
|
|
} |
1162 |
|
|
|
1163 |
pcg |
1.10 |
void connection::send_connect_request (int id) |
1164 |
pcg |
1.1 |
{ |
1165 |
|
|
connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1166 |
|
|
|
1167 |
|
|
slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1168 |
|
|
p->hmac_set (octx); |
1169 |
pcg |
1.10 |
send_vpn_packet (p, si); |
1170 |
pcg |
1.1 |
|
1171 |
|
|
delete p; |
1172 |
|
|
} |
1173 |
|
|
|
1174 |
pcg |
1.53 |
void connection::script_init_env (const char *ext) |
1175 |
|
|
{ |
1176 |
|
|
char *env; |
1177 |
|
|
asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1178 |
|
|
asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1179 |
|
|
asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1180 |
|
|
0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1181 |
|
|
conf->id & 0xff); putenv (env); |
1182 |
|
|
} |
1183 |
|
|
|
1184 |
|
|
void connection::script_init_connect_env () |
1185 |
pcg |
1.1 |
{ |
1186 |
pcg |
1.52 |
vpn->script_init_env (); |
1187 |
pcg |
1.1 |
|
1188 |
|
|
char *env; |
1189 |
|
|
asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1190 |
|
|
asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1191 |
|
|
asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1192 |
|
|
asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1193 |
|
|
} |
1194 |
|
|
|
1195 |
pcg |
1.3 |
const char *connection::script_node_up () |
1196 |
pcg |
1.1 |
{ |
1197 |
pcg |
1.53 |
script_init_connect_env (); |
1198 |
pcg |
1.1 |
|
1199 |
|
|
putenv ("STATE=up"); |
1200 |
|
|
|
1201 |
pcg |
1.52 |
char *filename; |
1202 |
|
|
asprintf (&filename, |
1203 |
|
|
"%s/%s", |
1204 |
|
|
confbase, |
1205 |
|
|
::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1206 |
pcg |
1.54 |
|
1207 |
|
|
return filename; |
1208 |
pcg |
1.1 |
} |
1209 |
|
|
|
1210 |
pcg |
1.3 |
const char *connection::script_node_down () |
1211 |
pcg |
1.1 |
{ |
1212 |
pcg |
1.53 |
script_init_connect_env (); |
1213 |
pcg |
1.1 |
|
1214 |
|
|
putenv ("STATE=down"); |
1215 |
|
|
|
1216 |
pcg |
1.52 |
char *filename; |
1217 |
|
|
asprintf (&filename, |
1218 |
|
|
"%s/%s", |
1219 |
|
|
confbase, |
1220 |
|
|
::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1221 |
pcg |
1.54 |
|
1222 |
|
|
return filename; |
1223 |
pcg |
1.1 |
} |
1224 |
|
|
|
1225 |
pcg |
1.40 |
connection::connection (struct vpn *vpn, conf_node *conf) |
1226 |
|
|
: vpn(vpn), conf(conf) |
1227 |
pcg |
1.1 |
, rekey (this, &connection::rekey_cb) |
1228 |
|
|
, keepalive (this, &connection::keepalive_cb) |
1229 |
|
|
, establish_connection (this, &connection::establish_connection_cb) |
1230 |
pcg |
1.40 |
#if ENABLE_DNS |
1231 |
pcg |
1.43 |
, dns (0) |
1232 |
pcg |
1.40 |
#endif |
1233 |
pcg |
1.1 |
{ |
1234 |
|
|
octx = ictx = 0; |
1235 |
|
|
retry_cnt = 0; |
1236 |
|
|
|
1237 |
pcg |
1.40 |
if (!conf->protocols) // make sure some protocol is enabled |
1238 |
|
|
conf->protocols = PROT_UDPv4; |
1239 |
|
|
|
1240 |
pcg |
1.1 |
connectmode = conf_node::C_ALWAYS; // initial setting |
1241 |
|
|
reset_connection (); |
1242 |
|
|
} |
1243 |
|
|
|
1244 |
|
|
connection::~connection () |
1245 |
|
|
{ |
1246 |
|
|
shutdown (); |
1247 |
|
|
} |
1248 |
|
|
|
1249 |
|
|
void connection_init () |
1250 |
|
|
{ |
1251 |
|
|
auth_rate_limiter.clear (); |
1252 |
|
|
reset_rate_limiter.clear (); |
1253 |
|
|
} |
1254 |
|
|
|